OBD codes / P0505
P0505
ModerateIdle Air Control System Malfunction
Get it looked at soon to avoid further wear.
Likely causes
- carbon-clogged idle air control valve
- dirty throttle body
- vacuum leak
Common fixes
- clean or replace the IAC valve
- clean the throttle body
Seeing P0505 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0505 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.